diff --git a/.gitignore b/.gitignore
index f40ff34..63e2c40 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 *.sh
 logdir*
 vis_*
+result*
 
 # Byte-compiled / optimized / DLL files
 __pycache__/
diff --git a/dreamer.py b/dreamer.py
index f593669..fba6bce 100644
--- a/dreamer.py
+++ b/dreamer.py
@@ -337,6 +337,7 @@ def main(config):
     acts = train_envs[0].action_space
     config.num_actions = acts.n if hasattr(acts, "n") else acts.shape[0]
 
+    state = None
     if not config.offline_traindir:
         prefill = max(0, config.prefill - count_steps(config.traindir))
         print(f"Prefill dataset ({prefill} steps).")
@@ -358,7 +359,7 @@ def main(config):
             logprob = random_actor.log_prob(action)
             return {"action": action, "logprob": logprob}, None
 
-        tools.simulate(random_agent, train_envs, prefill)
+        state = tools.simulate(random_agent, train_envs, prefill)
         logger.step = config.action_repeat * count_steps(config.traindir)
 
     print("Simulate agent.")
@@ -376,7 +377,6 @@ def main(config):
         agent.load_state_dict(torch.load(logdir / "latest_model.pt"))
         agent._should_pretrain._once = False
 
-    state = None
     while agent._step < config.steps:
         logger.write()
         print("Start evaluation.")
diff --git a/tools.py b/tools.py
index 14aa42d..59da93a 100644
--- a/tools.py
+++ b/tools.py
@@ -161,7 +161,7 @@ def simulate(agent, envs, steps=0, episodes=0, state=None):
         done = np.stack(done)
         episode += int(done.sum())
         length += 1
-        step += (done * length).sum()
+        step += len(envs)
         length *= 1 - done
 
     return (step - steps, episode - episodes, done, length, obs, agent_state, reward)